Paint-spraying apparatus



Sept. 10, 1929. w, '3, BEACH 1,727,500

PAINT SPRAYING APPARATUS I Filed Sept. 2, 1.927 2 Sheets-Sheet l J7 I I J7 55 $2., 42

7 Hf vfl, 5 5 w 40 50 I I] 4 l l 1 I;

, INVENTOR.

ATTORNEY w. c. BEACH PAINT SPRAYING APPARATUS Sept. 10, 1929.

Fil ed Sept. 2. 1927 2 Sheets-Sheet 2 INVENTOR.

ATTORNEY Patented Sept. 10, 1929.

PATENT OFFICE.

ILLAR c. IBEAGH, on NEWARK, NEW JERSEY.

PAINT-SPRAYING- -.APPARATUS.

Application filed September 2, 1927. Serial No. 217,102.

This invention relates to devices for delivering paint and similar semi-fluid 'substances, from a tank or like container, to

- an air brush bywhich it is dispensed in the form of a sprayas may be desired, and is an improvement on my former Patent Number 1,520,998 of Dec. 30, 1924, and also my pending application, Serial Number 14,920, filed March 12, 1925.

In common devices for similar purposes the only control for the compressed air is arranged at the distributing nozzle in con.- nection with the material passing through, causing considerable Waste.

In improved machines it has been considered necessary to supply control means for the air and material independently, and as these means ordinarily include two sets of cocks, reducing valves and pressure gages,

not only .is a considerable expense incurred,

but also valuable time taken in making adjustments etc.

It has been determined that such duplication of parts and waste of time is unnecessary, even prejudicial, to the most eflicient and economicaloperation of the apparatus, for the pressure on the material and on the air to produce a proper sprayingelfect is always relative, or in direct relation to the B viscosity and gravity of the material or fluid.

On thin, dilute or highly volatile material a low pressure is employed which pressure will also properly function to spray the material and as the material is heavier, more viscous or tenacious, the increased pressure necessary to raise the liquid to the spray head is also the correct pressure to function in spraying it. v Q

With these features in view, it is the principal object of this invention to produce a spraying apparatus so arranged that the air pressure is at. all times equal and uniform on the liquid and at the spray head,

5 the pressure being controlled by a single regulator for both the air and material.

Another object is in the provision offmeans whereby theair current may be used to thoroughly clean the spray head from the ma- BO 'terial after use, all of the material therein Figure 2 is a top plan view ofthe same,

indicating its application.

In the drawings, the numeral 10 designates a cylindrical tank to receive a paint containcr when in actual operation and acts as a temporary depository of the spray head or .paint gun '11, supply tubes 12 and 13 and other parts during storage or transportation. A pair of outstanding handles 14 are fixed securely to the sides of the tank 10, and near.

its upper edge are a plurality of paired lugs 15, between each pairof which are pivoted fswing bolts 17 having nuts 18 at their outer ends. V, l

A circular cover plate 20 having an annular flange 21 to extend over the top of the tank 10, is provided with outstanding radially slotted lugs 22,'into which the bolts 17 may swing on their pivots and the clamp nuts 18 used to secure the cover firmly in position.

On top of the cover is a central raised boss' I 24 providedwith a stem '26 having forks 27 between Which is a handle bar 28 serving the purpose of raising the cover when it is released or. of carrying the entire structure when the cover is clamped on the tank.

Compressed air from any supply source is led by'a pipe 29 to an air filter 30 and passes therefrom through a pipe 31 to the main' opening 32 of a Y fittinghaving branches 33 and 3 4 The branch 33 is connected with an air 4 cook 35 under'ready control'of its handle 36, a half turn of which entirelycloses the passageor opens it fully as may be desired.

Connected with the outlet of the cock 35 is an adjustable reducer valve'37 connected with a T fitting 38 havin vertical branches, one of which engages a p1pe40 leading through a boss 41 on the cover to the interior of the tank 10 supplying pressure therein and acting as an accumulator, tending to equalize the air pressure.

The other branch of the fitting 38 is connected by a pipe 42 with a gauge 43 which indicates the air pressure within-the pipe, and should this pressure become excessive it will blow oif automatically through a safety valve 44, controlled by a handle 45 and mounted on a boss 46 on the head in open communication with the interior of the tank.

Another boss 47, on the tank cover, carries a pipe 48 extending into a paint container 50 in the tank, the paint being caused to flow .upward through the pipe 48, due to the air pressure therein, and is delivered through an elbow 51 to a union 52 by which is engaged the paint supply tube 13 leading to the front portion of the air brush 11.

Connected with the other outlet 34 of the Y fitting is a pipe 54 entering one end 55 of a three-way valve 56, its opposite end 57 being connected by a union 58 to the air tube 12, de-

livering an air current to the spray head 11. The third, central opening 59 of the valve 56 has engaged in it a pipe 60 leading through a boss 61 on the cover and communicating with the space above the material container 50.

The valve 56 has a handle 62 arranged to open a passage through the central opening 59 and discharge end 57, closing the inlet 55, and causing the air confined in the tank 10 to enter the spray head and distribute the material conveyed to it by pipe 52 and its connections. When the spraying operation has been completed, the handle 62 is moved into the other of its extreme positions, closing the inlet 59 and. simultaneously opening the direct air inlet 55, thus blowing air through the spray head and cleansing it from all adherinmaterial, which is delivered through the tu e 13 to the container 50. I

The container 50 is one of several which may be used interchangeably for different materials, and it will be apparent that upon removal of the container, free access to the tank is permitted for cleaning and other purposes.

simple device for this purpose has been disclosed in the preferred form of its embodi ment, but it is not desired to restrict the details to the exact construction shown, it being obvious that changes, not involving the ex ercise of invention, may be made without conflicting With the scope of the appended claims. 7

I claim:

1. In a spraying apparatus, a spray head,

a liquid supply tank, a compressed air source having two conduits, one of said conduits having air reducing means for forcing the liquid from the tank to said head under variable pressure, the other conduit having a .head, and a three-way valve in the other conduit selectively operable to deliver air from said tank to said head in spraylng the material, closing the inlet from the air supply source, and to close the opening to said tank and admit air direct from said source to said head.

3. In aspraying apparatus, a

a supply tank for liquid to be sprayed, a comvalve construction, and thence through the reducer into the spray pressure tubes;

The air used to producepressure in the paint container, in forcing the material to the nozzle of the spray-head and for dispensing the same, also acts as pressure storage to.

equalize the pulsations of air as supplied from an air compressor, rendering .the operative supply fairly equable and uniform.

7 From the foregoing it will be seen that a press ed alr source in controllable communication with said tank to force liquid to said head, a conduit between said compressed air source and said head, and a three-way valve in said conduit operable to admit air from said tank to said head and close the inlet from said air source, or to close the inlet from said tank and open the inlet from said air source.

4. A device adapted to supply liquid under pressure to an ejecting atomizing head embodying a container confining said liquid, a Y-branch pipe, pneumatic means associated with the container for supplying said pressure and communicating with the Y-branch pipe, air reducing means carried by the container joining one branch of th'e'Y-pipe",'a.

multiple valve joining the remaining branch of said Y-pipe and cooperating with the hezfd and said, pneumatic means, and actuating means carried by said valve for cleansing said head.

5. In combination with a sprayer head, co-

operating with a liquid container, a compressed air source, a communicating branch associated with the air source, bifurcated integral communicating arms extending from said branch, air reducing means extending from one of. said arms and communicating with the interior of the container, a direct -air pipe extending from the other of said spray head, L

bifurcated arms, a vertically disposed liquid conveyor pipe within the container and suitably secured at one end thereof, a supplemental liquid conveyor pipe connecting said sprayer head with the vertical pipe, and means carried by said direct air pipe for releasing the pressure within the container for discharging the liquid in spray formation or for cleansing the head by compressed air from ably secured at one end thereof, a supplemental liquid conveyor pipe connecting said sprayer head with the vertical pipe, and a multiple valve carried by the direct air pipe for releasing the pressure within the cont ainer or for cleansing said sprayer head.

7 In a spraying apparatus, a spray head, a liquid' supply tank, a compressed air source having two conduits, means in one of said conduits for forcing liquid from the tank to the head under pressure, and valve means in the other conduit to enable the use of the air pressure delivered to the tank to spray the liquid from said head or to deliver. air direct lfI'OIl said compressed air source to said spray iea This specification signed this first day of September, 1927.

WILLARD O. BEACH. 

